JP2018008352A - Fastening torque control tool, nut and bolt with fastening torque control tool, and method for fitting of fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening torque control tool which can reliably perform screwed fastening at a prescribed fastening torque, can enhance a work efficiency at a low cost, and further, in which a usable screw member has a high degree-of-freedom.SOLUTION: A fastening torque control tool 1 comprises a fitting hole 21 which is externally fitted to a fastening outer peripheral surface constituted of a side part and a corner part of a screw member such as a lock nut 4, in which a fitting part 2, in which a projection 22 for contact holding the fastening outer peripheral surface is provided in the fitting hole 21, and a fastening torque introduction part 3, which has an outer peripheral surface 31 corresponding to the fastening outer peripheral surface of the screw member and on which an open hole 32 communicating with the fitting hole 21 is formed, are integrally formed. The projection 22 is so provided as to be collapsed by a load of a fastening torque which exceeds a prescribed fastening torque for the fastening outer peripheral surface of the screw member fitted into the fitting hole 21.SELECTED DRAWING: Figure 2

Description

  The present invention uses a tightening torque management tool, a nut and bolt with a tightening torque management tool, and a tightening torque management tool that are used to manage the tightening torque when a nut or bolt is screwed and tightened. It is related with the attachment method of the attachment to do.

  Conventionally, when attaching an attachment to a structure by tightening a bolt inserted through the attachment with a nut, especially when attaching the attachment to a structure that does not allow the attachment to drop or a structure that generates vibration, the attachment After tightening with a torque wrench after screwing the nut into the bolt inserted into the bolt, check whether the nut is tightened properly by covering the nut with the torque wrench again. Is generally done.

  When performing the work of confirming tightening after such construction in a place where a large number of nuts are tightened, the work of rotating a torque wrench on the nut one by one and rotating it in the tightening direction is performed for each of the many nuts. Since it is necessary to carry out, it is a work which requires a lot of labor and a long time. Therefore, a tightening torque management tool has been proposed that enables tightening with a predetermined tightening torque without requiring such confirmation work (see Patent Document 1).

  This tightening torque management tool is a synthetic resin in which a cover body having a recess to be attached to a nut and a tightening body rotated in a tightening direction are integrally connected by a connecting portion that is broken by a predetermined tightening torque. The tightening body is rotated with the recess attached to the nut, and the tightening body and the nut are rotated until the connecting portion breaks. According to this tightening torque management tool, it is possible to perform nut tightening with a predetermined tightening torque by rupturing the connecting portion without performing an operation of confirming tightening by covering the nut with the torque wrench tightened again.

  Moreover, there exists a nut of patent document 2 as what can confirm clamping | tightening of another nut. In this nut, a groove is provided between the upper nut portion and the lower nut portion, the upper nut portion and the lower nut portion are connected by a connecting portion provided in the groove portion, and the connecting portion is tightened to a predetermined tightening torque or more. Is designed to break. When the nut is tightened, the connecting portion is broken by tightening at a predetermined tightening torque or more, and the upper nut portion is detached from the bolt. Therefore, the state tightened with a predetermined tightening torque is a state in which only the lower nut portion is left on the bolt, and this state can be visually confirmed from a remote position.

Japanese Patent Laid-Open No. 2001-140832 Japanese Patent Laying-Open No. 2015-224781

  By the way, in the tightening torque management tool of Patent Document 1, after tightening the nut with a predetermined tightening torque, the separated cover body covered with the nut is removed, or the separated cover body is put over the nut. When bonding with an adhesive, other work is required after the nut tightening work. If such other work is performed, it will be necessary to also perform the construction confirmation work with respect to another work, and work time will be extended correspondingly. In particular, when the work time is restricted due to intensive construction or nighttime traffic closure, it is strongly required to perform an appropriate tightening work without taking extra work time.

  In addition, when using a nut with a tightening torque control tool that has been previously covered with a nut with an adhesive and using the nut for tightening operation, cover each nut with the cover body of the tightening torque control tool. It is necessary to prepare an adhesive-attached nut in advance or to prepare such a pre-adhered expensive nut with a tightening torque management tool, leading to a decrease in work efficiency and an increase in parts cost. .

  Further, since Patent Document 2 is a nut in which an upper nut portion that is removed by breakage of a connecting portion and a lower nut portion that functions as a nut as it is are integrally formed, the nut cannot be freely selected. For example, if it is decided to use a special locking nut first, or if the height of the nut is specified, the nut of Patent Document 2 cannot be used. The tightening torque cannot be managed. Furthermore, the upper nut portion and the lower nut portion need to be made of the same material, which also limits the degree of freedom of the nut that can be used.

  The present invention is proposed in view of the above-described problems, and is capable of reliably performing screwing and fastening with a predetermined tightening torque, improving work efficiency at a low cost, and further usable screwing. It is an object of the present invention to provide a tightening torque management tool having a high degree of freedom for a member, a nut and bolt with a tightening torque management tool, and an attachment method using the tightening torque management tool.

The tightening torque management tool of the present invention has a fitting hole that is externally fitted to a tightening outer peripheral surface composed of a side portion and a corner portion of a screwing member, and the tightening outer periphery is inside the fitting hole. A fitting portion provided with a protrusion for abutting and holding the surface and an outer peripheral surface corresponding to the tightening outer peripheral surface of the screwing member, and a through hole communicating with the fitting hole are formed. A tightening torque introducing portion is integrally formed, and the protrusion is provided so as to be crushed by a load of a tightening torque exceeding a predetermined tightening torque with respect to the tightening outer peripheral surface fitted in the fitting hole. It is characterized by.
According to this, when the tightening torque introducing portion is rotated during tightening of the screwing member, the tightening torque is transmitted from the tightening torque introducing portion to the screwing member via the fitting portion and the protrusion, and the predetermined tightening torque is transmitted. Since the protrusions are crushed and the tightening torque management tool idles when the tightening torque is exceeded, the operator can easily and clearly detect the completion of the tightening with the predetermined tightening torque. Screw fastening and accurate torque management can be reliably performed. Furthermore, the screw fastening with the predetermined tightening torque and the accurate torque management can be performed regardless of the type of method of rotating the tightening torque management tool. Even if it is gripped and fastened with a nut at high speed, it is possible to reliably perform screw fastening with a predetermined tightening torque and accurate torque management. In addition, even when the projections are crushed and the tightening torque management tool is idle, the fitting portion and the tightening torque introducing portion maintain the integrity without breaking, so that the screw tightening with a predetermined tightening torque is performed. Later, the integral tightening torque management tool can be easily removed from the threaded member. That is, it is not necessary to remove a part of the separated cover body or the like of the tightening torque management tool after the fastening or to bond the part to a screwed member such as a nut with an adhesive. Further, it is not necessary to previously bond the tightening torque management tool to a threaded member such as a nut with an adhesive. Therefore, the overall work process can be reduced and work efficiency can be increased. Moreover, an expensive nut with a tightening torque management tool including the pre-bonding operation cost is not required, and screw fastening with a predetermined tightening torque can be performed at low cost. In addition, the construction manager can easily confirm the screw fastening and construction completion with the predetermined tightening torque without trouble by simply confirming that there is no residual tightening torque management tool. The completion of construction can be easily confirmed even by visual inspection. In addition, since the tightening torque management tool can be removed as a unit after the construction without breaking, the construction management can be reliably performed by managing the number of the nuts and the number of the tightening torque management tools. Moreover, it does not require deformation or breakage of a screwed member such as a nut, and can be applied without selecting the type of screwed member such as a nut. For example, it can be applied to a special nut such as a locking nut. It is possible, has a high degree of freedom in the screwing member that can be used, and is extremely excellent in versatility.

The tightening torque management tool of the present invention is characterized in that the protrusion is provided so as to press and hold the side portion of the tightening outer peripheral surface.
According to this, by forming the protrusion that presses and holds the side of the tightening outer peripheral surface, the shape of the protrusion can be simplified, and the protrusion is reliably crushed when a predetermined tightening torque is exceeded. The tightening torque management tool can be idled.

The tightening torque management tool of the present invention is characterized in that the protrusion is provided so as to engage and hold the corner portion of the tightening outer peripheral surface.
According to this, since the protrusion engages with the corner portion of the tightening outer peripheral surface and holds the screwing member, the tightening outer peripheral surface of the screwing member can be held with a strong holding force. A high holding state of the screwing member can be obtained, and the protrusion can be reliably crushed when the predetermined tightening torque is exceeded, and the tightening torque management tool can be idled.

In the tightening torque management tool of the present invention, the protrusion is provided so as to extend in the insertion direction of the screwing member, and the holding surface of the protrusion gradually protrudes inward toward the back side of the fitting hole. It is provided with an inclination.
According to this, it is possible to easily press-fit the tightening outer peripheral surface of the screwing member into the fitting hole while ensuring stable holding of the tightening outer peripheral surface of the screwing member. The attachment work of screwing members such as nuts can be facilitated.

The nut with a tightening torque management tool according to the present invention is such that the fitting hole of the tightening torque management tool according to the present invention is fitted onto the tightening outer peripheral surface of the nut so that the tightening torque management tool and the nut are integrated. It is provided.
According to this, the fastening operation of the nut can be performed more efficiently by performing the fastening operation using the nut with the tightening torque management tool in which the tightening torque management tool and the nut are integrally provided.

The bolt with the tightening torque management tool of the present invention is such that the fitting hole of the tightening torque management tool of the present invention is externally fitted to the tightening outer peripheral surface of the bolt head so that the tightening torque management tool and the bolt are It is provided integrally.
According to this, the fastening operation of the bolt can be performed more efficiently by performing the fastening operation using the bolt with the fastening torque management tool in which the fastening torque management tool and the bolt are integrally provided.

The attachment method of the present invention is an attachment method for attaching an attachment using the tightening torque management tool of the present invention, wherein the attachment is fitted into the fitting hole of the tightening torque management tool and The nut held in contact with the protrusion is screwed into the bolt shaft protruding from the attachment, and the tightening torque introducing portion is rotated and tightened, and the bolt shaft is protruded into the through hole. A first step, a second step of applying a tightening torque exceeding a predetermined tightening torque to crush the protrusions at corners of the tightening outer peripheral surface of the nut, and causing the tightening torque management tool to idle. And a third step of removing the attached torque management tool from the nut and the bolt shaft portion.
According to this, the same effect as that of the tightening torque management tool of the present invention can be obtained, and the screw tightening with the predetermined tightening torque can be surely performed regardless of the length of the bolt shaft portion protruding from the nut. It can be carried out. Further, the integrated tightening torque management tool can be removed from the screwing member very easily by crushing the protrusion and idling of the tightening torque management tool.

  According to the present invention, it is possible to reliably perform the screw fastening with the predetermined tightening torque, and to reliably crush the protrusion when the predetermined tightening torque is exceeded, and by the idling of the tightening torque management tool, The integral tightening torque management tool can be removed from the threaded member very easily. In addition, work efficiency can be increased at low cost. Furthermore, the freedom degree of the screwing member which can be used can be raised.

(A) is the front side perspective view of the clamping torque management tool of 1st Embodiment by this invention, (b) is the bottom side perspective view, (c) is the longitudinal cross-sectional view. (A)-(c) is bottom explanatory drawing explaining crushing of the protrusion of the clamping torque management tool of 1st Embodiment. The perspective view which shows the nut fitted with the fastening torque management tool of 1st Embodiment. FIG. 3 is an explanatory perspective view showing a bolt shaft protruding from an attachment and a nut fitted into the tightening torque management tool of the first embodiment screwed into the bolt shaft. (A) is the front side perspective view of the clamping torque management tool of 2nd Embodiment by this invention, (b) is the bottom side perspective view, (c) is the longitudinal cross-sectional view. (A)-(c) is bottom explanatory drawing explaining crushing of the protrusion of the clamping torque management tool of 2nd Embodiment.

[Tightening torque management tool of the first embodiment]
As shown in FIGS. 1 to 4, the tightening torque management tool 1 according to the first embodiment of the present invention includes a fitting portion 2 and a tightening torque introducing portion 3 that are integrally formed. It is integrally formed of a copolymer synthetic resin such as polyethylene or ABS resin, a synthetic resin such as engineering plastics having excellent heat resistance such as polycarbonate, or aluminum or an aluminum alloy.

  The fitting portion 2 is formed with a fitting hole 21 which is fitted on the outer peripheral surface of the fastening member, which is a nut or a bolt, in the approximate center. Inside the fitting hole 21, there is provided a protrusion 22 that abuts and holds the tightening outer peripheral surface of a screwing member composed of side portions and corner portions such as nuts or bolt heads. The protrusion 22 is provided so as to press and hold the side portion of the tightening outer peripheral surface of the screwing member constituted by side portions and corner portions such as nuts or bolt heads. In the illustrated example, each protrusion 22 is provided at a position corresponding to the center of each side of a hexagonal nut or hexagonal bolt head so that each holding surface 221 abuts on each side.

  The inner peripheral surface 211 of the fitting hole 21 is formed so as to be inclined so that the inner diameter of the fitting hole 21 becomes slightly smaller toward the fitting direction of the screwing member (upward direction in FIG. 1C). . The protrusions 22 are provided so as to extend in the insertion direction of the screwing member, and are formed at substantially the same height as a whole in the insertion direction, and are formed following the inclination of the inner peripheral surface 211, whereby the protrusions 22 are formed. The holding surface 221 is provided with a slight inclination so as to gradually protrude inward toward the inner side of the fitting hole 22.

  In the fitting hole 21 in which the protrusion 22 is formed, a tightening outer peripheral surface of a screwing member composed of a side portion and a corner portion such as a nut or bolt head is inserted, and each side portion of the tightening outer peripheral surface is inserted. The tightening outer peripheral surface of the screwing member is fitted so that the projection 22 abuts only on a part (near the center) of the screw and the side portions are partially held. Any appropriate type of nuts and bolts can be used in the fitting holes 21. For example, a locking nut 4 shown in FIGS. 2B, 3 and 4 other than a normal nut is fitted. May be combined.

  The loosening prevention nut 4 has a female screw hole 41 formed on the inner side, has a substantially hexagonal tightening outer peripheral surface 42 in plan view constituted by side portions 421 and corner portions 422, and is fitted in the vicinity of the upper end of the female screw hole 41. In the state of being fitted in the joint hole 21, a leaf spring 43 is provided at a position facing the tightening torque introducing portion 3 so as to protrude inside the female screw hole 41. In the state where the bolt shaft portion is screwed into the female screw hole 41, the locking nut 4 exhibits the function of preventing the locking by deforming the plate spring 43 and engaging with the thread of the bolt shaft portion. In general, a nut having a locking function can exhibit a locking effect only when the tightening torque is accurately controlled. Therefore, the present invention is particularly effective.

  Further, the protrusion 22 is a tightening torque that exceeds a predetermined tightening torque with respect to a tightening outer peripheral surface of a screwing member configured by a side portion and a corner portion such as a nut or bolt head fitted in the fitting hole 21. It is provided so that it may be crushed by the load of. In the present embodiment, the hardness of the material of the integrally formed tightening torque management tool 1 is made lower than the hardness of the screwing member or the tightening outer peripheral surface so that the protrusions 22 are relatively soft. The screw member is configured to be crushed by a load of a tightening torque exceeding a predetermined tightening torque with respect to the tightening outer peripheral surface of the screwing member.

  The external shape of the fitting portion 2 in plan view is appropriate. For example, the fitting portion 2 has a shape that secures a required thickness around the fitting hole 21 to obtain a stable strength. It has an outer shape.

  The tightening torque introduction part 3 has an outer peripheral surface 31 corresponding to a tightening outer peripheral surface of a screwing member that is a nut or a bolt, and is a screwing member configured by side and corner parts such as a nut or bolt head. The shape corresponds to the tightening outer peripheral surface. In the illustrated example, it is formed in a substantially regular hexagonal shape in plan view corresponding to the shape of the tightening outer peripheral surface of the nut or bolt head that is substantially regular hexagonal shape in plan view. The size of the outer peripheral surface 31 of the tightening torque introducing portion 3 is substantially the same as the size of the tightening outer peripheral surface of a nut or bolt head.

  A through hole 32 communicating with the fitting hole 21 is formed in the approximate center of the tightening torque introducing portion 3. The plan view shape and the outer diameter of the through hole 32 are appropriate as long as the bolt shaft portion protruding by screwing from the nut fitted in the fitting hole 21 is not in contact with the inner peripheral surface of the through hole 32. As shown in FIG. 4, the bolt shaft portion 5 protruding by screwing from the locking nut 4 fitted in the fitting hole 21 does not contact the inner peripheral surface of the through hole 32. Further, the inner peripheral surface 211 of the fitting hole 21 is configured not to contact a corner portion 422 such as a nut or a bolt head.

  The tightening torque management tool 1 is installed on a nut or bolt head by fitting a fitting hole 21 on a tightening outer surface of a nut to be fastened at a construction site or a tightening outer surface of a bolt head. The attached torque introducing portion 3 may be used by rotating it with a tool such as a torque wrench. For example, the fitting hole 21 of the tightening torque management tool 1 is loosened by the locking nut 4 as shown in FIG. The tightening torque management tool 1 and the nut, such as a nut with a tightening torque management tool that is externally fitted to the tightening outer peripheral surface 42 at the factory and integrally provided with the tightening torque management tool 1 and the locking nut 4, are integrated. If the nut with the tightening torque management tool provided is pre-configured, and the nut tightening operation and attachment work are performed at the construction site using the nut with the tightening torque control tool, the nut tightening operation is made more efficient and reliable. It can be carried out in a suitable manner.

  When attaching the attachment 7 using the tightening torque management tool 1 or the nut with the tightening torque management tool, for example, as shown in FIG. 4, the washer 6 is attached to the bolt shaft portion 5 protruding from the attachment 7. Inserted into the bolt shaft portion 5 protruding from the attachment 7 is the locking nut 4 fitted in the fitting hole 21 of the tightening torque management tool 1 and held in contact with the projection 22 outside the washer 6. Screw together. Then, the tightening torque introducing portion 3 is rotated and tightened with a tool such as a torque wrench in the direction of the thick two-dot chain line arrow in FIG. It protrudes into the through hole 32. In the illustrated example, the locking nut 4 is screwed in until the tip end portion of the bolt shaft portion 5 projects outward from the through hole 32.

  Thereafter, the locking nut 4 is tightened gradually, and when the tightening torque introducing portion 3 is rotated by applying a tightening torque exceeding a predetermined tightening torque, the corner portion of the tightening outer peripheral surface 42 of the locking nut 4 is rotated. The protrusion 22 is crushed at 422 and its periphery to become a crushing protrusion 22m, and there is a gap that does not contact the corner 422 between the protrusion 22 and the protrusion 22, so that the tightening torque management tool 1 idles (FIG. 2). (See (b) and (c)). At this time, when the tightening torque management tool 1 and its protrusion 22 are made of synthetic resin and the protrusion 22 is crushed, not only the protrusion 22 is deformed but also a part of the protrusion 22 is scraped to generate powder. The operation of tightening the locking nut 4 by applying a tightening torque exceeding a predetermined tightening torque due to the remaining powder can be confirmed.

  Thereafter, the tightening torque management tool 1 that has been idled is removed from the locking nut 4 and the bolt shaft 5, and the mounting of the attachment 7 by fastening the locking nut 4 is completed.

  In addition, a bolt with a tightening torque management tool in which the fitting torque 21 of the tightening torque management tool 1 and the bolt are integrally provided by fitting the fitting hole 21 of the tightening torque management tool 1 to the tightening outer peripheral surface of the bolt head. It may be configured in advance, and the bolts with tightening torque management tool may be used to perform bolt fastening and attachment work at the construction site. By performing the fastening operation using the bolt with the tightening torque management tool, it is possible to perform the bolt fastening operation more efficiently.

  According to the first embodiment, when the tightening torque introducing portion 3 is rotated during tightening of the screwing member, the locking nut 4 or the like is screwed from the tightening torque introducing portion 3 via the fitting portion 2 and the protrusion 22. The tightening torque is transmitted to the member, and when the predetermined tightening torque is exceeded, the projection 22 is crushed and the tightening torque management tool 1 rotates idly, so that the operator can easily complete the tightening with the predetermined tightening torque. And it can detect clearly and can perform the screwing fastening by the predetermined | prescribed fastening torque, and exact torque management reliably. Further, the screw fastening with the predetermined tightening torque and the accurate torque management can be performed regardless of the type of the method of rotating the tightening torque management tool 1, for example, a tightening torque introducing portion with an electric tool. Even if the nut 3 is gripped and fastened with a nut at high speed, it is possible to reliably perform screw fastening with a predetermined tightening torque and accurate torque management.

  Further, even when the projection 22 is crushed and the tightening torque management tool 1 is idle, the fitting portion 2 and the tightening torque introducing portion 3 maintain the integrity without breaking, so that the predetermined tightening torque is maintained. After the screw fastening, the integral tightening torque management tool 1 can be easily detached from the screw member. That is, it is not necessary to remove a part of the separated cover body or the like of the tightening torque management tool 1 after the fastening or to bond the part to a screwed member such as a nut with an adhesive. Moreover, the operation | work which adhere | attaches the tightening torque management tool 1 in advance with screwing members, such as a nut, with an adhesive agent is unnecessary. Therefore, the overall work process can be reduced and work efficiency can be increased. Moreover, an expensive nut with a tightening torque management tool including the pre-bonding operation cost is not required, and screw fastening with a predetermined tightening torque can be performed at low cost.

  In addition, the construction manager can easily confirm the screw fastening and the completion of the construction with a predetermined tightening torque without any trouble just by confirming that the tightening torque management tool 1 does not remain. It is possible to easily confirm the completion of construction even visually. Moreover, since the tightening torque management tool 1 can be removed as one piece after the construction without breaking, the construction management can be reliably performed by managing the number of construction nuts and the number of tightening torque management tools. Further, it does not require deformation or breakage of a screwed member such as a nut, and can be applied regardless of the type of screwed member such as a nut. For example, it can be applied to a special nut such as a locking nut 4. The usable screwing member has a high degree of freedom and is extremely excellent in versatility.

  Further, by providing the protrusion 22 so as to press and hold the side portion of the tightening outer peripheral surface, the shape of the protrusion 22 can be simplified, and the allowable range of the dimensional error of the formed protrusion 22 can be expanded. Can do. Further, the protrusion 22 is provided so as to extend in the inserting direction of the screwing member, and the holding surface 221 of the protrusion 22 is provided so as to be inclined so as to gradually protrude inward toward the back side of the fitting hole 21, thereby being screwed. It is possible to easily press-fit the tightening outer peripheral surface of the screwing member into the fitting hole 21 while ensuring stable holding of the tightening outer peripheral surface of the member, and screwing a nut or the like to the tightening torque management tool 1. The member mounting operation can be facilitated.

  Further, when a nut such as the locking nut 4 is fitted in the fitting hole 21 of the tightening torque management tool 1, the fitting hole 21 communicates with the through-hole 32 and the through-hole of the bolt shaft portion 5 is used. 32 is configured to allow projection into the opposite side of the fitting hole 21 of the through-hole 32 and the fitting hole 21 of the through-hole 32. Therefore, the length of the bolt shaft portion 5 protruding from the screwed nut is restricted. Therefore, the screw fastening with a predetermined tightening torque can be reliably performed. Further, the crushing of the protrusions 22 and the idling of the tightening torque management tool 1 allow the integrated tightening torque management tool 1 to be removed from the screwing member very easily after the attachment is attached.

[Tightening torque management tool of the second embodiment]
As shown in FIGS. 5 and 6, the tightening torque management tool 1 a according to the second embodiment of the present invention includes a fitting portion 2 a and a tightening torque introducing portion 3 similar to that of the first embodiment. The whole is integrally formed of a copolymer synthetic resin such as polypropylene, polyethylene, and ABS resin, or a synthetic resin such as engineering plastic having excellent heat resistance such as polycarbonate, or aluminum or aluminum alloy.

  In the fitting portion 2a, a fitting hole 21 that is externally fitted to a tightening outer peripheral surface of a screwing member that is a nut or a bolt is formed at a substantially center. Inside the fitting hole 21, there is provided a protrusion 22a that abuts and holds the tightening outer peripheral surface of the screwing member composed of a side portion and a corner portion such as a nut or bolt head portion, which is the second embodiment. The protrusion 22a is provided so as to be engaged with and held by a corner portion of a tightening outer peripheral surface of a screwing member constituted by a side portion and a corner portion such as a nut or bolt head portion. In the illustrated example, each protrusion 22a is provided at a position corresponding to each corner of the hex nut or hexagonal bolt head so that only the periphery of each corner is engaged, and the holding surface 221a of the protrusion 22a has a corner. It abuts on the part and its periphery.

  As in the first embodiment, the inner peripheral surface 211 of the fitting hole 21 has an inner diameter slightly smaller toward the fitting direction of the screwing member (upward direction in FIG. 5C). It is formed to be inclined. The protrusion 22a is provided so as to extend in the insertion direction of the screwing member, and is formed at substantially the same height as a whole. By forming the protrusion 22a following the inclination of the inner peripheral surface 211, the holding surface 221a of the protrusion 22a is formed. It is provided with a slight inclination so as to gradually protrude inward toward the inner side of the fitting hole 21.

  In the fitting hole 21 in which the protrusion 22a is formed, a fastening outer peripheral surface of a screwing member composed of a side portion and a corner portion such as a nut or bolt head is fitted, and each corner portion of the tightening outer peripheral surface is inserted. The tightening outer peripheral surface of the screwing member is fitted so that the protrusion 22a engages only at the periphery and holds each corner. In addition, the inner peripheral surface 211 of the fitting hole 21 is configured such that a gap that does not contact the side portion 421 such as a nut or bolt head portion is partially formed. As the nut and bolt to be fitted into the fitting hole 21, an appropriate type such as a locking nut 4 can be used.

  The protrusion 22a is also loaded with a tightening torque that exceeds a predetermined tightening torque with respect to the tightening outer peripheral surface of the screwing member constituted by a side portion and a corner portion such as a nut or bolt head fitted in the fitting hole 21. It is provided so that it may be crushed by. In the present embodiment, the hardness of the material of the integrally formed tightening torque management tool 1a is made lower than the hardness of the screwing member or the tightening outer peripheral surface so that the protrusion 22a becomes relatively soft. The screw member is configured to be crushed by a load of a tightening torque exceeding a predetermined tightening torque with respect to the tightening outer peripheral surface of the screwing member.

  Other configurations of the tightening torque management tool 1a of the second embodiment are the same as those of the tightening torque management tool 1 of the first embodiment. Furthermore, a nut with a tightening torque management tool or a bolt with a tightening torque management tool can be configured using the tightening torque management tool 1a as in the first embodiment. Further, for example, the protrusion 22a is crushed to be a crushing protrusion 22n at or around the corner 422 of the tightening outer peripheral surface 42 of the locking nut 4, and there is a gap that does not contact the side 421 between the protrusion 22a and the protrusion 22a. Since it exists, the attachment 7 can be attached by the same process as in the first embodiment, such as idling the tightening torque management tool 1a (see FIGS. 6B and 6C). At this time, when the tightening torque management tool 1a and its protrusion 22a are made of synthetic resin and the protrusion 22a is crushed, not only the protrusion 22a is deformed but also a part of the protrusion 22a is scraped to generate powder. The operation of tightening the locking nut 4 or the like by applying a tightening torque exceeding a predetermined tightening torque due to the remaining powder can be confirmed.

  According to the second embodiment, the protrusion 22a engages with the corner portion of the tightening outer peripheral surface of the screwing member to hold the screwing member, whereby the tightening outer peripheral surface of the screwing member such as the locking nut 4 is secured. It can be held with a strong holding force, and a highly stable holding state of the screwing member can be obtained, and the nut or bolt head and the fitting portion 2a can be linked with high stability when tightening. it can. In addition, a corresponding effect can be obtained from the configuration corresponding to the first embodiment.

[Modifications of Embodiment, etc.]
In addition to each invention and each embodiment, the invention disclosed in this specification is specified by changing these partial configurations to other configurations disclosed in this specification within the applicable range, or these It includes those specified by adding other configurations disclosed in this specification to the configuration, or those obtained by deleting these partial configurations to the extent that partial effects can be obtained and specifying them as a superordinate concept. The following modifications are also included.

  For example, the protrusion 22 of the first embodiment and the protrusion 22a of the second embodiment have the shape of a ridge extending in the insertion direction of the screwing member. However, the present invention is not limited to this. For example, the dot-like protrusion 22 is formed in the insertion direction. A configuration in which a plurality of the dot-like projections 22 are provided so as to correspond to each side of the tightening outer peripheral surface of the screwing member, or a plurality of the dot-like projections 22a are provided in the insertion direction. In addition, it is possible to adopt a configuration in which the point-like protrusions 22a and the point-like protrusions 22a are engaged so as to sandwich each corner of the tightening outer peripheral surface of the screwing member.

  Further, in the configuration in which the holding surface 221 of the protrusion 22 and the holding surface 221 a of the protrusion 22 a are provided so as to gradually protrude inward toward the back side of the fitting hole 21, the inner peripheral surface 211 of the fitting hole 21. May be configured such that the height of the protrusion 22 and the protrusion 22a gradually increases inward toward the inner side of the fitting hole 21 and is inclined without being inclined in a tapered shape.

  The present invention can be used when, for example, an attachment such as an attachment plate or a connection plate is screwed and fastened to various structures.

DESCRIPTION OF SYMBOLS 1, 1a ... Tightening torque management tool 2, 2a ... Fitting part 21 ... Fitting hole 211 ... Inner peripheral surface 22, 22a ... Protrusion 22m, 22n ... Crushing protrusion 221, 221a ... Holding surface 3 ... Tightening torque introduction part DESCRIPTION OF SYMBOLS 31 ... Outer peripheral surface 32 ... Through-hole 4 ... Loosening prevention nut 41 ... Female screw hole 42 ... Fastening outer peripheral surface 421 ... Side part 422 ... Corner | angular part 43 ... Leaf spring 5 ... Bolt shaft part 6 ... Washer 7 ... Attachment

Claims (7)

The fitting member has a fitting hole that is externally fitted to the fastening outer peripheral surface formed by the side and corner portions of the screwing member, and a protrusion that abuts and holds the fastening outer peripheral surface is provided inside the fitting hole. A mating part,
A tightening torque introducing portion having an outer peripheral surface corresponding to the tightening outer peripheral surface of the screwing member and having a through hole communicating with the fitting hole is integrally formed,
Tightening torque management, wherein the protrusion is provided so as to be crushed by a load of a tightening torque exceeding a predetermined tightening torque with respect to the tightening outer peripheral surface fitted in the fitting hole. Ingredients.   The tightening torque management tool according to claim 1, wherein the protrusion is provided so as to press and hold the side portion of the tightening outer peripheral surface.   2. The tightening torque management tool according to claim 1, wherein the protrusion is provided so as to engage and hold the corner portion of the tightening outer peripheral surface. The protrusion is provided to extend in the insertion direction of the screw member;
The tightening torque according to any one of claims 1 to 3, wherein the holding surface of the protrusion is provided to be inclined so as to gradually protrude inward toward the back side of the fitting hole. Management tool.   The fitting torque control tool according to any one of claims 1 to 4, wherein the fitting hole is externally fitted to a tightening outer peripheral surface of the nut, and the tightening torque management tool and the nut are integrally provided. A nut with a tightening torque control tool.   5. The tightening torque management tool according to claim 1, wherein the fitting hole is externally fitted to a tightening outer peripheral surface of a bolt head, and the tightening torque management tool and the bolt are integrally provided. A bolt with a tightening torque control tool. An attachment method for attaching an attachment using the tightening torque management tool according to any one of claims 1 to 4,
A nut fitted in the fitting hole of the tightening torque management tool and held in contact with the protrusion is screwed into a bolt shaft portion protruding from an attachment, and the tightening torque introducing portion is rotated and tightened. And a first step of projecting the bolt shaft portion into the through hole;
A second step of applying a tightening torque exceeding a predetermined tightening torque to crush the protrusions at corners of the tightening outer peripheral surface of the nut and idle the tightening torque management tool;
And a third step of removing the tightening torque management tool from the nut and the bolt shaft part.

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